/Engine/Plugins/Experimental/LearningAgents/Source/LearningTraining/Public/LearningPPOTrainer.h
This trainer can be used to allow the python training process the run on a different machine to the experience gathering process.
struct FSocketPPOTrainer : public [UE::Learning::IPPOTrainer](API\Plugins\LearningTraining\IPPOTrainer)